1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81from datetime import datetime, timedelta
from typing import Iterable, Sequence
import httpx
from tenacity import retry, stop_after_attempt, wait_exponential
from box import Box
from config import OVERPASS_API_INTERPRETER
from latlon import LatLon
from polygon import Polygon
from utils import http_headers
def _split_by_count(elements: Iterable[dict]) -> list[list[dict]]:
result = []
current_split = []
for e in elements:
if e['type'] == 'count':
result.append(current_split)
current_split = []
else:
current_split.append(e)
assert not current_split, 'Last element must be count type'
return result
def _build_buildings_query(boxes: Iterable[Box], timeout: int) -> str:
buffer = 0.00001 # account for possible floating point errors
return (
f'[out:json][timeout:{timeout}];' +
f''.join(
f'way({box.point.lat-buffer},{box.point.lon-buffer},{box.point.lat+box.size.lat+buffer},{box.point.lon+box.size.lon+buffer});'
f'out body qt;'
f'>;'
f'out skel qt;'
f'out count;'
for box in boxes)
)
def _is_building(element: dict) -> bool:
return any(
check in tag
for tag in element.get('tags', {}).keys()
for check in ('building', 'man_made'))
@retry(wait=wait_exponential(), stop=stop_after_attempt(5))
def query_buildings(boxes: Sequence[Box]) -> Sequence[Sequence[Polygon]]:
result = tuple([] for _ in boxes)
for years_ago in (0, 1, 2):
timeout = 180
query = _build_buildings_query(boxes, timeout)
if years_ago > 0:
date = datetime.utcnow() - timedelta(days=365 * years_ago)
date_fmt = date.strftime('%Y-%m-%dT%H:%M:%SZ')
query = f'[date:"{date_fmt}"]{query}'
r = httpx.post(OVERPASS_API_INTERPRETER, data={'data': query}, headers=http_headers(), timeout=timeout * 2)
r.raise_for_status()
elements = r.json()['elements']
for i, slice in enumerate(_split_by_count(elements)):
ways = (e for e in slice if e['type'] == 'way')
ways = (e for e in ways if _is_building(e))
node_id_to_latlon = {
node['id']: LatLon(float(node['lat']), float(node['lon']))
for node in slice if node['type'] == 'node'}
for way in ways:
points = tuple(node_id_to_latlon[node_id] for node_id in way['nodes'])
if len(points) >= 3: # ignore invalid polygons
result[i].append(Polygon(points))
return result